Current transformer terminal connector



June 23, 1942. J. ROGOFF 2,287,762

' CURRENT TRANSFORMER TERMINAL CONNECTOR Filed Jul 25, 1959 NV OR.

Mm" fia of BY C JW ATTORNEY.

Patented June 23, 1942 v umrao STAT ES PATENT OFFICE CURRENT rnnnsromaTERMINAL V .oomcron Julian Rogofl, New York, N. z, assignor-to I BurndyEngineering Company. Inc., a corpora-' tion of New York Application July25, 1939, Serial No. 286,335

2 Claims.

My invention relates to terminal connectors such as are used forJoining. wires or cables to current transformer terminals or to similarfiat bar extensions. i

The principal object of my invention is to provide a terminal connectorwhich is low in cost v and inexpensive to install and maintain.

, Another object of my invention is to provide a terminal connectorwhich can be rotated to any angle on the flat bar so that connections toheavy cables can be made without bending or twisting the cable.

Still another object of my invention is to provide a connector whereinthe current path between cable and flat bar is direct and passes thruonly one interposing part.

A further object of my invention is to provide a terminal connectorcapable of accommodating any one of a variety of cables and variousthicknesses of flat bar.

Another object of my invention is to provide a terminal connector whichclamps both cable and flat bar with a single clamping bolt and nut.

Current transformers are used with metering or current measuringinstruments and are usuallyowned by the utility company supplyingelectric power to the consumer. To avoid a multiplicity of sizes theyare made in a few standard One end of thecurrent transformer capacities.is usually connected to the utility companys service entrance cable andthe other end is joined to the consumer's cable.- Inasmuch as thesecables may bev constructed and insulated differently, they may be andusually are of different sizes. In addition the utility may move thecurrent transformer from one customers premises to anothers, or thecustomer may inangle it would be necessary to bend the cable-a diflicultoperation in restricted space. There- .fore, the current transformerterminal connector should be able to join the cable at an angle to theflat bar.

In addition to accommodating a. large'range of conductor sizes at anyangle, the current trans former terminal connector must be compact sothat it may be easily taped. Current transformers are usually usedindoors and all live parts should be insulated.-

In order to provide a clamp of minimum expense my terminal connector isprovided with a single bolt and nut. The clamp is mounted on thetransformer bar and the bolt is inserted, from the opposite side of thebar through the hole which is punched therein. The bolt forces thepressure bar against the cable and the assembly is completed bytightening the nut against the flat bar. The nut not only clamps theconnector to the bar, 'it also locks the assembly tight againstvibration.

I accomplish these and .other objects and obtain my new results as willbe apparent from the ,dBVlCB described in the following specification,

crease his electrical consumption and therefore increase the size. ofhis cable. All of these reasons, and others, require a terminalconnector for the current transformer which will accommodate a widerange of cable sizes and which will clamp any one -of the cables equallyefliciently. Sometimes, where current consumed is large, the customermay have two or more cables which mustfbe joined to the currenttransformer and the terminal connector must be suitable for clamping amultiplicity of cables.

Although current transformers are fairly standard in design andcapacity, various manufacturers equip their transformers with differentsizes of flat bars. Inasmuch as the current transformers owned by anysingle public utility company may be made by several manufacturers;

it is necessary that the current transformer terparticularly pointed outin and illustrated in the accompanying drawing, in

which Fig. 1 shows an end view of the terminal connector mounted on themaximum size cable and bar. H 4

Fig. 2 shows a side view of the same.

Fig. 3 shows an end view of the terminal connector mounted on theminimum size cable and maximum size bar.

Fig. 4 is a sectional view Fig. 2. 1

Reference numeral l0 designates the tubular connector body, with a Vshaped bottom II and a threaded aperture l2, transversely positionedthrough the side l3 opposite the V shaped bottom to receive a bolt l4. Apressure bar l5, V shaped as at It, with extending ears I I for theattached claims,

along line of 4-4 of" channelling the bar within the body of theconnector is provided. The bolt II, with hexagonal head It, hasassociated with it lock nut l9 and washer 20. The flat bar terminal 2|connecting to current transformer (not shown), aperture 22 for entranceof the bolt.

The connector is mounted on the transformer bar 2| and the bolt Hinserted from the opposite side through aperture 22. Rotating the boltforces pressure bar l5 against the conductor within the body l0, and theassembly is completed by tightening the lock nut I! which simultaneouslylocks the bolt against the conductor as well as the connector on theplate, in the desired position, about the axis of the bolt, so thatbending heavy conductors is made unnecessary.

in Fig. 3, the connector In the position shown smallest size conductor,

can accommodate the and provision is made in mum. size plate. The bolthas a length suilicient to lock both into position.

I have thus described my invention, but I desire it understood that itis not confined to the particular forms or uses shown and described, thesame being merely illustrative, and that the invention may be carriedout in other ways without departing from the spirit of my invention,and, therefore, I claim broadly the right to employ all equivalentinstrumentalities coming within the scope of the appended claims, and bymeans of which, objects of my invention are attained and new resultsaccomplished, as it is obvious that the particular embodiments hereinhas anthis position for maxishow and described are only some of the manythat can be employed to attain these objects and accomplish theseresults.

What I claim and desire to secure by Letters Patent, is as follows:

1. An electrical connection comprising a rigid tubular connector body; astationary plate. said face of said body and projecting through thestationary plate to press the pressure bar against the cable within theconnector body and to sup port the cable, the pressure bar. and theconnector body' on the stationary plate, said screw having a lengthsufficient to grip a cable of minimum diameter and extend through thestationary plate; and a nut positioned on said screw for s1-multaneously locking the screw against rotation and the connector bodyto the stationary plate.

2. An, electrical connection of the type described in claim I.characterized by having the inner cable engaging surface shaped V-shapedto center thecable, and by having the pressure bar face V-shaped with acable engaging surface at the apex of the V-shaped face, to allowmaximum approach of the pressure bar to the cable engaging surface ofthe connector body, to enage a cable of minimum diameter.

JULIAN ROGOFF.

